Surgical drain bag and support therefor



June 4, 1968 o. R. BRENNER ETAL 3,386,444

SURGICAL DRAIN BAG AND SUPPORT THEREFOR Filed Nov. 7, 1966 3Sheets-Sheet 1 'INVENTOILS' June 4, 1968 o. R. BRENNER ETAL 3,386,444

SURGICAL DRAIN BAG AND SUPPORT THEREFOR Filed Nov. 7, 1966 5 Sheets'Sheet z INVENTORJ.

' 7a W %r /M June 4, 1968 b. R. BRENNER ETAL' 3,386,444

SURGICAL DRAIN BAG AND SUPPORT THEREFOR Filed Nov. '7, 1966 5Sheets-Sheet 3- I mvamoas. ;7E; 10 {9% X7 5W Z2 whit ATTORNEYS UnitedStates Patent 3,386,444 SURGICAL DRAIN BAG AND SUPPORT THEREFOR OrlestusR. Brenner and George L. Rescr, Cincinnati, Ohio, assignors to RitterPfaudler Corporation, Rochester, N.Y., a corporation of New YorkContinuation-impart of application Ser. No. 311,741, Sept. 26, 1963.This application Nov. 7, 1966, Ser. No. 600,332

9 Claims. (Cl. 128-292) This invention relates to a surgical drain bagand support assembly for receiving bodily fluid draining from a patientduring a medical examination or operation. The bag and support means ofthis invention are particularly intended for use with surgical andurological tables.

This application is a continuation-in-part of our copending applicationSer. No. 311,741, filed Sept. 26, 1963, now abandoned.

In urological and certain types of surgical practice the patientreclines on a table which is positionable, with respect to itssupporting stand, both in the vertical direction and about a horizontalaxis. The physician or surgeon works at one end of the table, facing theK.U.B. tract area.

In examination and surgery upon the patient it frequently occurs thatfluids drain in some quantity from the KUB tract, and it is thereforecustomary to provide some means for receiving or collecting the drainingfluids.

In the past there has been provided for this purpose a metal drawer-likebox which is pulled out from beneath the end of the table for collectingsuch draining fluids.

The drawer type of fluid collecting means has presented the disadvantagethat it must be pushed back into the table as the doctor approaches thetable more closely than permitted by the drawer in its fully orsemi-extended position; the drawer must then be manually reopened as thedoctor again steps back from the end of the table.

It has been a primary objective of this invention to provide a surgicaldrain bag and support assembly which in the normal position will presentan adequate area for receiving or collecting draining fluids, yet whichwill gradually close with almost no effort as the doctor approaches thetable more closely, and which will automatically reopen as he thereaftermoves away.

In carrying out the primary objective of the invention it has been afurther objective to provide a surgical drain bag and support meanstherefor which will present an increasingly greater vertical area ofsplash protection to the doctors person as he moves toward the examiningor operating table.

Another object of the invention has been to provide a drain bag andmodified support means therefor which can be moved, as desired, betweenfully open or drain position, through an attitude affording maximumsplash protection, to a fully closed position in which the bag andsupport are completely out of the way, to afford maximum elbow room tothe surgeon.

Another object of the invention has been to provide a sterilizable,disposable bag which can readily be attached to and removed from itssupport means on the table as needed, and which can be inexpensivelymanufactured.

The further details of the structure and use of the surgical drain bagand support means of this invention may best be described by referenceto the accompanying drawings, in which:

FIGURE 1 is a perspective view of a urological table equipped with drainbag support means in accordance with this invention, and shows thesurgical drain bag as mounted on the support means,

FIGURE 2 is an enlarged perspective view of the end portion of theurological table shown in FIGURE 1 and "ice illustrates the manner in'which the splash surface of the bag is moved upwardly and toward theend of the table to provide a greater area of splash protection for thesurgeon as he moves closer to the table,

FIGURE 3 is a perspective view of a surgical bag in accordance with theinvention and shows the bag in open position,

FIGURE 4 is a vertical transverse section of the bag and illustrates thedrain outlet at the bottom thereof,

FIGURE 5 is a perspective view illustrating how the front edge of thebag is attached to the table,

FIGURE 6 is a perspective view showing the end portion of a urologicaltable provided with the bag support means and with the bag mountedthereon, the bag being in the normal, or maximum open, attitude,

FIGURE 7 is a side elevation of a modified or articulated form ofsupport in accordance with the invention, shown in extended position,

FIGURE 8 is a perspective view of the modified support, showing thesupport and bag in normal position, and supporting the doctors arms,

FIGURE 9 is a perspective view similar to FIGURE 8, but showing thesupport in partially hinged or folded attitude for maximum splashprotection, and

FIGURE 10 is a perspective View similar to FIGS. 8 and 9 but showing themodified support in fully closed or folded position, to give maximumelbow room.

A surgical drain bag in accordance with the invention is designatedgenerally by the numeral 10 in the drawings. In FIGURE 1 the bag 10 isshown as mounted for use by the support means of the invention at theoperating end of a surgical or urological table 11 which is providedwith X-ray equipment. With the exception of the bag support meansprovided thereon, to be described hereinafter, the table 11 may beconventional. For illustrative purposes, a suitable table 11 includes abase 12, a table support column 13 extending above the base 12, and apatient table frame 16 which is movably connected to and supported bythe column 13. As is conventional, the table frame 16 is equipped withadjustably positionable swingable knee crutches 17. X-ray apparatus 19may be mounted to a tube support 20 above the table frame 16, and aBucky diaphragm 21 is mounted in the table frame 16 beneath the X-rayequipment 19 for radiographic work.

It will be understood that the patient rests on the surface 22 of thetable frame 16 with his knees supported by the crutches 17 in a positionconvenient for examination of the K.U.B. tracts, cystoscopy,transurethral surgery, etc. As shown in FIGURE 1, the surgeon orexamining physician usually or frequently works seated on a stool at theend of the table. At the operating end the table surface 22 may beextended angularly downward for drainage, as at 23.

One form of support means for the drain bag 10 is shown in FIGS. 1, 2, 5and 6 and is hinged or articulately connected to table frame 16'adjacent to and below the end of the table or the angular surface 23thereof, through frame structure designated generally by 27.

The bag 10 is best shown in FIGURES 3 and 4, and is of invertedpyramidal form, having a front wall 30, a rear wall 31, side walls 32and 33 and a bottom 34. (As used herein, front signifies the directiontoward the head of the table, while rear signifies the oppositedirection. It should be noted that opposite terminology is sometimesused in urological practice.) The width of the bag, i.e., the dimensionbetween the sides 32 and 33 at the top, is preferably approximatelyequal to the width of the table surface 22. The front wall 30 of the bagextends upwardly above the upper edges 37 of the side walls 32 and 33 toprovide an apron 38. At the upper or forward edge of apron 38 the sheetmaterial is folded over and secured to 3 apron 38 to define a tunnel 39which extends from side to side of the apron.

The rear wall 31 of the bag It extends upwardly above the upper edges 37of the side walls to provide a splash surface 41. The splash surfacepreferably extends out about 8 inches from the edges 37. The sheetmaterial is folded over at the outer edge 45 of the splash surface 41and is secured to itself along its side edges 44 to form a pocket 42which opens at its lower end 43.

The bag 10 may conveniently be formed from a blank of flexible waterimpervious sheet material such as .002 inch polyethylene, and may beassembled into the configuration described by conventional heat sealingtechniques. In such fabrication, the side walls 32 and 33 may be sealedalong their center or vertically bisecting lines. The tunnel and pocketportions may also be adhered by heat sealing.

A drain outlet opening is provided in bottom 34 of the bag 10. Thisoutlet comprises a flanged, tubular drain coupling 47 which is securedinto an opening in the bottom of the bag. A strainer 48 is fitted intothe drain coupling 47 on the interior of the bag. As shown in FIG- URE4, the strainer 48 may simply comprise a coil spring which is woundclosed upon itself at its upper end.

The bag 10 is connected to the table frame 16 by means which cooperatewith the tunnel 39 at the front of the bag and means which are engagedin pocket 42 at the rear of the bag. These means include, respectively,an elongated semi-flexible member or bendable flat strip or bar 54 whichis passed through the tunnel 39, and a bail 55 which is inserted intothe pocket portion 42 of the bag (see FIGURES 2, and 6).

The table frame 16 is provided with two spaced brackets, one of which isshown at 58 in FIGURES 5 and 6. The brackets 58 are positioned, forexample, closely beneath and slightly forward of the table end or of thelower edge of the angulated surface 23 of the table. The spacing ofthese brackets 58 corresponds to the width of the apron 38 of the bag,and should preferably be about equal to the width of the table. Eachbracket 58 is provided with a recess or aperture for receiving an end ofthe flexible strip 54. Projecting tips are formed at the top edge of thestrip 54 at each end thereof for insertion into the recesses in brackets58. The bag is connected along its forward edge to the table by slightlybending the strip 54 inserted into the tunnel 39, as shown in FIGURE 5,and seating its opposite ends in the respective recesses of the mountingbrackets 58.

The splash surface 41 of the bag is supported in open position orattitude with respect to the apron 38 by the bail 55 previouslymentioned. This bail 55 may be formed in heavy wire, and is generallyU-shaped in the horizontal plane. It has two upwardly bent legs 59 whichare approximately perpendicular to the over-all plane of the bail. Thesides or limbs 56 of the U-shaped part of the bail are preferably bentslightly upwardly adjacent to the outer end 63 of the bail, as at 57(see FIGURE 5).

At their respective upper ends the bail legs 59 are preferably turnedinwardly toward each other as at 62. These inwardly turned tips 62 areinserted into and are swingable about a pair of pivots 60 provided onthe table frame 16. With the bag removed, the limbs 56 of the bail canbe sprung slightly apart and the tips 62 inserted into the pivots 60.The pivots 60 are preferably rearward of (i.e., away from the tablesurface) and slightly above the brackets 58 (see FIGURE 5) to providefor easier swingability of the bail. The pivots 69 are suitably mountedon a transverse brace 61 connected to the table frame, and as shown inFIGURE 6 this brace 61 acts as a stop against which the legs 59 of thebail ordinarily rest under the influence of gravity. Tension of thesheet material, which increases with the weight of fluid in the bag,holds the tips 62 in their pivots 6%). When the table surface 22 ishorizontal the U-shaped portion of the bail 55 pref- 4 erably resides insuch position that the outer edge 63 0f the bail is higher than thepivots 65 The projected length of the bail, that is, the distance fromthe pivots 60 to the ouer edge 63 of the bail, is such than when thestrip 54 is inserted into tunnel 39 and is seated in its brackets 58 andthe bail is inserted into the pocket 42, the bag hangs in open positionas shown in FIGURE 6. Both the apron 38 and splash surface 41 slopedownwardly toward the open mouth 65 of the bag.

By these support means 27 the drain bag 10 is held in such position thatbodily fluids draining from a patient on the table surface 22 will runinto the bag 10 off the angulated table surface 23 or will be directedinto the bag from the apron 38 or splash surface 41. In use the drainoutlet coupling 47 may be connected to a drain line, as shown at 67 inFIG. 1.

It may be noted in this connection that by reason of the diameter of thebail wire in relation to the thickness of the sheet material of whichthe bag 10' is made, the bail can provide, if the tension on the bag isnot great, a slightly raised rim around the periphery of splash surface41, i.e., around sides 44 and the outer edge 45 of the pocket. This rimhelps confine fluid falling onto the splash surface 41 to prevent itfrom running over the outer edges of that surface and to cause it todrain into the bag. It will also be noted that the pliability of theflexible material reduces splash.

In normal open position the bag is held open by the bail so as topresent a relatively large area in the horizontal plane to collectdraining fluids. One of the important further advantages of the bag andbag support of this invention, however, is that the bag will yield asthe surgeon moves close to the table, yet at the same time does sowithout reducing the effective area of protection and in fact byproviding greater protection to the surgeon against splash. This featureof operation is shown in FIG- URE 2. As the surgeon approaches the endof the table more closely, the outer edge 63 of the bail is engaged byhis chest and/ or arms and is lifted or swings upwardly about pivots 66.If the inclination of the table frame 16 is such that the outer edge 63of the bail is slightly above the pivots 60, a force directed toward thetable in the horizontal direction will of itself cause the bail to beswung upwardly around the pivots. As this occurs, the splash surface 41of the bag slides up the chest of the surgeon toward a more verticalposition, thereby affording greater splash protection to that area ofhis person. The force of gravity holds the bail against the chest, andthe bail moves up easily as the surgeon approaches the table, providingno significant impediment to his free movement. As the surgeon stepsaway from the table, gravity automatically restores the bag to maximumopen position in which the legs 59 rest against brace 61.

It can be seen from the foregoing description that, with the drain bagsupport shown in FIGS. 1, 2, 5 and 6, as the physician moves toward thetable the outer end 63 of the bail will swing in an are about the pivots60, and that as the splash surface 41 rises it may tend to block orscreen and thereby limit the operating room in close proximity to thepatient. It can also be seen that the bag will not ordinarily remain ina position in which the bail legs 59 are swung upwardly from the framemember 61.

In FIGURES 7-10 there is shown a modified form of drain bag supportmeans, in which the bail, rather than being connected directly to thetable, is connected to the table by an intermediate member which itselfis pivotally connected to the table. This embodiment will hold the bagin a closed position, yet without restricting the surgeons movement.

The drain bag used in connection with the support shown in FIGURES 710may be identical with that previously described, and is designated at 10and has a tunnel and pocket as previously described. In this embodiment,the bail 55 has upstanding legs 70 with inturned tips 71 at their upperends (see FIG. 7). These tips 71 are pivotally journalled in aperturesprovided in spaced ears 72 mounted on a U-shaped wire member, bail orpivot 73. The U-shaped member generally designated by 73 includesparallel limbs 74 and a base 75. The spacing of the limbs 74 is slightlyless than the spacing of the legs 70 of the bail 55, so that the tips 71can be engaged in the ears 72. The ears 72 comprise sheet metal elementssecured about the respective limbs 74 adjacent base 75, as best shown inFIGURE 7. At their upper ends, the limbs 74 are pivotally connected topivot means on the table such as those designated by 60 previouslydescribed.

This doubly articulated connection of the bail 55 to the table permitsthe bail to be swung to a closed position in which it will remain, yetin which the splash surface does not block the operating area at all.

The normal attitude of the bag with the modified support is shown inFIGURE 8. Engagement of the bail legs 70 with the ears 72 and/ or limbs74 prevents downward movement of the bail 55. In this position the bail55 affords support to the surgeons arms, as shown in the figure. When aforwardly directed horizontal force is exerted upon the bail 55, thelegs 70 thereof pivot about the tips 71, as shown in FIGURE 9, swingingthe apron of the bag upward and forwardly to a position of maximumsplash protection. If released from such position, the weight of the bagwill swing the bail downwardly to the position shown in FIGURE 8.However, if the bail 55 and the bag are swung over center, to theposition shown in FIG- URE 10, it will be seen that the splash surfacecomes to rest against the table end below the table surface. Thisaffords the surgeon a maximum of elbow room; moreover, his movement isnot restricted by the weight of the bag and the bail does not pressagainst him. Detents such as those shown at 76 in FIGURE 7 on the ears72 engage the legs 70 and hold the bail in such position until manuallyswung back.

It is contemplated that the surgical drain bag may be sterilized inmanufacture so as to be ready for immediate use as needed. The bag beingof inexpensive construction, it is disposable and can be replaced at lowcost after each use.

While a preferred embodiment of the invention has been described, itwill be understood that the invention is not limited to that form alonebut also includes other variations and modifications falling within thescope of the following claims.

We claim:

1. In combination, a surgical drain bag and support means therefor,

said drain bag being formed of flexible, water impervious sheet materialand having front, rear, and side walls, said bag being closed at thebottom and open at the top thereof,

said sheet material extending contiguously above the front wall therebypresenting an apron leading into the opening at the top of said bag,

means defining a tunnel extending from side to side of said apron,

said sheet material extending contiguously above the rear wall of saidbag and thereby presenting a splash surface leading into the opening atthe top of said bag opposite said apron,

means presenting a pocket on the underside of said splash surface, saidpocket opening downwardly and being closed along the sides and topthereof,

said support means comprising,

an elongated member inserted through said tunnel from side to side ofsaid apron,

bracket means receiving the ends of said elongated member,

a bail having a U-shaped portion and legs extending upwardly from thelimbs of said U-shaped portion, said U-shaped portion having a shape anddimensions corresponding to the interior of said pocket,

, said U-shaped portion being inserted into said pocket,

pivot means journalling the legs of said bail for swinging movementabout an axis parallel to said elongated member,

means limiting the movement of said bail about said axis such that saidbail normally rests under gravity in an attitude holding said bag open,

frame structure supporting said bracket means,

structure supporting said pivot means,

said elongated member and bail respectively supporting said apron andsplash surface in planes inclining downwardly to the opening at the topof the bag pendant therebelow.

2. The combination of claim 1 wherein said structure supporting saidpivot means is provided on a surgical table.

3. The combination of claim 1 wherein said structure supporting saidpivot means comprises a second U-shaped member which is itself pivotallyconnected at the ends of its limbs to a surgical table, said U-shapedmember having pivots on the limbs thereof pivotally mounting the legs ofsaid bail.

4. In combination, a surgical drain bag and support means therefor,

said drain bag being formed of flexible, water impervious sheet materialand having front, rear, and side Walls, said bag being closed at thebottom and open at the top thereof,

sheet material extending contiguously above the front wall therebypresenting an apron leading into the Opening at the top of said bag,

the sheet material forming said apron being folded over and secured ontoitself above said front wall to define a tunnel extending from side toside of said apron at the top thereof,

sheet material extending contiguously above the rear wall of said bagand thereby presenting a splash surface leading into the opening at thetop of said bag opposite said apron,

said sheet material forming said splash surface being folded over at thetop of splash surface and secured to said splash surface along the sidesthereof to present a downwardly opening pocket,

outlet means in the bottom of said bag,

said support means comprising,

a flat, flexible strip inserted through said tunnel from side to side ofsaid apron,

bracket means detachably receiving the ends of said strip,

a bail having a *U-shaped portion and legs extending angularly upwardlyfrom the limbs of sad U-shaped portion, said U-shaped portion having ashape and dimensions corresponding to the interior of said pocket, saidU-shaped portion being inserted into said pocket, said legs projectingupwardly above the lower end of said pocket,

pivot means journalling the legs of said bail for swinging movementabout an axis parallel to said strip,

means limiting the downward movement of said bail about said axis suchthat said bail normally rests under gravity in an attitude holding saidbag open,

the outer end of said bail residing in a horizontal plane which is abovethe horizontal plane containing said axis, whereby a horizontal forcedirected toward said tunnel on the outer end of said bail will causesaid bail to swing upwardly about said axis, structure supporting saidbracket means,

and structure mounting said pivot means.

5. The combination of claim 4 wherein said structure mounting said pivotmeans is itself pivotally mounted to a surgical table for swingingmovement about an axis parallel to said strip.

6. In combination, a surgical drain bag and support means therefor,

said drain bag being formed of flexible, water impervious sheet materialand being generally of inverted pyramidal form and having front, rear,and side walls, said bag being closed at the bottom and open at the topthereof, said front wall extending above said side walls to form anapron, attachment means at the upper edge of said apron connecting thesame at the end of a surgical table, said rear wall extending above saidside walls to form a splash surface, means presenting a pocket on theunderside of said splash surface, said pocket opening downwardly andbeing closed along the sides and top thereof, a bail having a portioninserted into said pocket, said bail having legs extending upwardly fromsaid portion, colinear pivot means on the ends of said legs, meansmounted to said surgical table journalling said tips for swingingmovement about a horizontal axis above the walls of said bag, said bailengageable with stop means to limit movement of said bail about saidaxis such that said bail rests under gravity with said portionapproximately horizontal, said portion being swingable upwardly fromsaid stop means but not downwardly. 7. The combination of claim 6wherein said journalling means comprises a member connected to saidtable for swinging movement about an axis parallel to said first namedaxis, the tips of said legs being connected to said member over saidrear Wall,

8. In combination, a surgical drain bag and support means therefor,

said drain bag being formed of fiex'ible, water impervious sheetmaterial and having front, rear, and side Walls, said bag being closedat the bottom and open at the top thereof, attachment means detachablyattaching the front wall of said bag beneath the end of a urologicaltable, the rear wall of said bag extending above the upper edges of saidside walls to form a splash surface, said rear wall being folded underat the top of said splash surface and secured to the underside thereofalong its side edges thereby presenting a downwardly opening pocket,

angularly upwardly from the limbs of said U-shaped portion, saidU-shaped portion having a shape and dimensions corresponding to theinterior of said pocket, said U-shaped portion being inserted into saidpocket,

inturned tips lying in a common line on the ends of said legs,

pivot means articulately connected to said table, said pivot meansjournalling said tips for swinging movement about a horizontal axis,said pivot means being swingable about a second axis parallel to saidhorizontal axis,

stop means limiting the movement of said bail about said horizontal axissuch that said bail rests under gravity with said U-shaped portion ofsaid bail holding said pocket and splash surface away from saidattachment means,

said pivot means and stop means normally holding said bag in an openposition with said splash surface extending away from said front wall,said stop means permitting said bail to move upwardly but not downwardlyfrom said position.

9. A surgical drain bag formed of flexible, water impervious sheetmaterial, said bag having front, rear, and side walls, said bag beingclosed at the bottom and open 5 at the top thereof,

a transverse, horizontal tunnel formed across the top of said frontwall,

the rear wall of said bag extending above the upper edges of said sidewalls to form a splash surface,

RICHARD A. GAUDET, Primary Examiner. CHARLES F. ROSENBAUM, Examiner.

1. IN COMBINATION, A SURGICAL DRAIN BAG AND SUPPORT MEANS THEREFOR, SAIDDRAIN BAG BEING FORMED OF FLEXIBLE, WATER IMPERVIOUS SHEET MATERIAL ANDHAVING FRONT, REAR, AND SIDE WALLS, SAID BAG BEING CLOSED AT THE BOTTOMAND OPEN AT THE TOP THEREOF, SAID SHEET MATERIAL EXTENDING CONTIGUOUSLYABOVE THE FRONT WALL THEREBY PRESENTING AN APRON LEADING INTO THEOPENING AT THE TOP OF SAID BAG, MEANS DEFINING A TUNNEL EXTENDING FROMSIDE TO SIDE OF SAID APRON, SAID SHEET MATERIAL EXTENDING CONTIGUOUSLYABOVE THE REAR WALL OF SAID BAG AND THEREBY PRESENTING A SPLASH SURFACELEADING INTO THE OPENING AT THE TOP OF SAID BAG OPPOSITE SAID APRON,MEANS PRESENTING A POCKET ON THE UNDERSIDE OF SAID SPLASH SURFACE, SAIDPOCKET OPENING DOWNWARDLY AND BEING CLOSED ALONG THE SIDES AND TOPTHEREOF, SAID SUPPORT MEANS COMPRISING, AN ELONGATED MEMBER INSERTEDTHROUGH SAID TUNNEL FROM SIDE TO SIDE OF SAID APRON, BRACKET MEANSRECEIVING THE ENDS OF SAID ELONGATED MEMBER, A BAIL HAVING A U-SHAPEDPORTION AND LEGS EXTENDING UPWARDLY FROM THE LIMBS OF SAID U-SHAPEDPORTION, SAID U-SHAPED PORTION HAVING A SHAPE AND DIMENSIONSCORRESPONDING TO THE INTERIOR OF SAID POCKET, SAID U-SHAPED PORTIONBEING INSERTED INTO SAID POCKET, PIVOT MEANS JOURNALLING THE LEGS OFSAID BAIL FOR SWINGING MOVEMENT ABOUT AN AXIS PARALLEL TO SAID ELONGATEDMEMBER, MEANS LIMITING THE MOVEMENT OF SAID BAIL ABOUT SAID AXIS SUCHTHAT SAID BAIL NORMALLY RESTS UNDER GRAVITY IN AN ATTITUDE HOLDING SAIDBAG OPEN, FRAME STRUCTURE SUPPORTING SAID BRACKET MEANS, STRUCTURESUPPORTING SAID PIVOT MEANS, SAID ELONGATED MEMBER AND BAIL RESPECTIVELYSUPPORTING SAID APRON AND SPLASH SURFACE IN PLANES INCLINING DOWNWARDLYTO THE OPENING AT THE TOP OF THE BAG PENDANT THEREBELOW.
 9. A SURGICALDRAIN BAG FORMED OF FLEXIBLE, WATER IMPREVIOUS SHEET MATERIAL, SAID BAGHAVING FRONT, REAR, AND SIDE WALLS, SAID BAG BEING CLOSED AT THE BOTTOMAND OPEN AT THE TOP THEREOF, A TRANSVERSE, HORIZONTAL TUNNEL FORMEDACROSS THE TOP OF SAID FRONT WALL, THE REAR WALL OF SAID BAG EXTENDINGABOVE THE UPPER EDGES OF SAID SIDE WALLS TO FORM A SPLASH SURFACE, SAIDREAR WALL BEING FOLDED UNDER AT THE TOP OF SAID SPLASH SURFACE ANDSECURED TO THE UNDERSIDE THEREOF ALONG ITS SIDE EDGES SO AS TO PRESENT ADOWNWARDLY OPENING POCKET ABOVE SAID SIDE WALLS, AND DRAIN OUTLET MEANSAT THE BOTTOM OF SAID BAG.